0123-4870 0123-4870 S0123-48702019000200127 10.17227/folios.50-10226 Colombia 00 12 2019 00 12 2019 50 127 138

1997 2014 3 4 4 2011 13 2 2 11-28 1988 72 2 2 150-62 1984 2 262-76 2008 1986 20 3 3 63-490 1998 151-7 2009 27 1 1 69-90 1998 21 1 1 1-20 1989 23 647-78 2012 25 2 2 216-47 1990 2010 2007 1993 77 4 4 459-71 1993 105-30 1981 35-60 1998 2002 2004 87-204 2009 2013 9 4 4 515-33 1994 78 285-99 2004 Singapore 1997 81 2 2 189-96 2000 3 2 2 58-76 2014 4 10 10 2138-43 2012 14 1 1 79-89 2010 28 1 1 156-74 1993 43 263-87 2004 1999 50 1-19 2013 1 1 1 8-20 2001 2007 11 36-58 2009 11 1 1 29-40 2008 20 2 2 216-31 2007 57 155-99 2003 631-78 1997 199-227 2013 6 6 6 77-85 2007 19 2 2 105-20 1988 111-25 1997 15 39-57 2002 2003 3rd ed